Correlation of Initial Slope of Thermoelectric Power and Electronic Specific-Heat Constant for Solid Solutions Based on Ce and Eu Compounds(Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)

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The thermoelectric power, S, of metals is known to be linear with respect to temperature, T, in the low-temperature limit. The proportionality between the initial slope of the S(T) curve and the electronic specific-heat constant, γ, both at the T=0 limit, has been attracting attention for Ce compounds and other substances showing the heavy-Fermion state. However, there has been no study on solid solutions in relation to the present interest. We collected existing data of both S(T) and γ on solid solutions based on Ce and Eu compounds, and we confirmed again the proportionality between the two quantities for their composition ranges covering the emergence of the heavy-Fermion state but having no magnetic order. The heavy-Fermion state in the Eu-based compounds has never been investigated in relation to the present interest. The similarity between the valence-transition temperature, T_V, for Eu compounds and the Kondo temperature, T_K, for Ce compounds is discussed. Observations of the sign change in the S(T) curves and the existence of a peak in the ρ(T) curves, ρ being the resistivity, at around T_V for Eu compounds are noteworthy.
社団法人日本物理学会の論文
2005-07-15